皮皮学,免费搜题
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【单选题】
乙醚合成实验中,通过( )来除去蒸馏出来的原料乙醇。
A.
NaOH 溶液
B.
饱和 NaCl 溶液
C.
饱和 CaCl 2 溶液
D.
饱和 NaC O 3 溶液
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【多选题】直流电动机常用起动方法( )。
A.
电枢回路串电阻起动
B.
降压起动
C.
直接起动
D.
星三角形降压起动
【简答题】He was (honor) ______ as the king of silent films.
【简答题】直流电动机起动时电枢回路串入电阻是为了( )。 A .增加起动转矩 B .限制起动电流 C .增加主磁通 D .减小起动时间
【简答题】阅读理解。 My uncle has a great sports collection. He loves sports very much. And he loves all balls. He likes playing basketball and volleyball.And he likes playing basketball and volleyball. He also like...
【单选题】What would the man love to do?
A.
He loves to look after his cat.
B.
He loves to take care of her cat.
C.
He wouldn't like to do it.
【简答题】He loves science fiction in particularly .              __________
【简答题】阅读理解。 My father has a great sports collection. He loves sports very much. And he loves all balls. He likes playing basketball and volleyball. And he likes playing baseball and tennis. He also likes wa...
【简答题】阅读理解。 My uncle has a great sports collection. He loves sports very much. And he loves all balls. He likes playing basketball and volleyball. He also likes watching balls. How many balls does he ha...
【多选题】直流电动机的起动方法有( )
A.
直接起动
B.
升压起动
C.
降压起动
D.
电枢回路串电阻起动 E 弱磁起动
E.
弱磁起动
【多选题】直流电动机起动的方法有
A.
电枢回路串电阻分级起动
B.
降压起动
C.
调波起动
D.
升压起动
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